Philips Semiconductors

Product specification

SA647

Low-voltage digital IF receiver

1998 Aug 10

12

GENERAL APPLICATIONS CIRCUIT

MIXER

+–

SR01730

10

8

7

6

4

3

2

1

5

9

20

19

18

17

16

14

13

12

11

15

RSSI

LO

OSC

OUT

C9

R1

C7

VCC

C4

C1

C18

C17

C22

RF

INPUT

LIMITER

OSCILLATOR

+–

R2

IF

AMP

C11

C12

LIMITER

OUT(–)

LIMITER

OUT(+)

POWER

DOWN

RSSI

R3

C14

C15

R5

R4

C13

BUFF

RSSI BUFF

Component List

R2 and R3 set the RSSI buffer gain. For unity gain short R2 (Pin 7 to Pin 8)

and leave R9 open.

R8

C20

L3

R7

R6

L1

C3

C23

C24

FLT1

FLT2

R15

R16

R14

R13

R10

R9

C21

C19

C16

C25

R18

R17

R19

C5

C8

L2

C6

C2

NOTE:

5

1

3

4

3

4

1

LO

INPUT

2

5

2

C1

5–30pF

C11

0.1

mF

C21

10nF

R1

10K

W

R13

240

W

L1

180nH

C2

5–30pF

C12

6.8pF

C22

0.1

mFR2

0

W (short) R14 4.5KW

L2

180nH

C3

0.1

mF

C13

0.1

mF

C23

0.1

mF

R3

OPEN

R

15 180W

L3

56

mH

C4

0.1

mF

C14

30pF

C24

10nF

R4

5.1k

R16

180

W

FLT1,2

600kHz

C5

0.1

mF

C15

30pF

C25

10nF

R5

5.1k

R17

240

W

C6

0.1

mF

C16

0.1

mFR6

0

W (short) R18 10KW

C7

47pF

C17

0.1

mF

R7

1.5K

W

R19

10K

W

C8

1nF

C18

0.1

mF

R8

1.5K

W

C9

10pF

C19

10nF

R9

180

W

C10

3.9pF

C20

1500pF

R10

180

W

R11

10K

W

R12

0K

W

GND

Figure 8.